Besides gaining reputation with your questions and answers, you receive badges for being especially helpful. Badges appear on your profile page, flair, and your posts.

Question Badges

First bounty you manually awarded on another person's question
15 awarded
First bounty you manually awarded on your own question
42 awarded
Asked a well-received question on 5 separate days, and maintained a positive question record
310 awarded
First bounty you offered on another person's question
17 awarded
Question score of 10 or more
463 awarded
Asked a question with 1,000 views
4.9k awarded
First bounty you offered on your own question
73 awarded
Asked a question and accepted an answer
3.1k awarded
Asked first question with score of 1 or more
6.6k awarded
Asked a question with no votes, no answers, no comments, and low views for a week
251 awarded

Answer Badges

Edited and answered 1 question (both actions within 12 hours, answer score > 0)
72 awarded
Answer score of 10 or more
1.1k awarded
Answered more than 30 days later as first answer scoring 2 or more
271 awarded
Answered your own question with score of 3 or more
102 awarded
Answered first question with score of 1 or more
2.8k awarded

Participation Badges

Completed "About Me" section of user profile
7k awarded
Visited an election during any phase of an active election and had enough reputation to cast a vote
369 awarded
Left 10 comments
672 awarded
Earned at least 200 reputation (the daily maximum) in a single day
32 awarded
Followed the Area 51 proposal for this site before it entered the commitment phase
87 awarded
One post with score of 2 on meta
138 awarded
Posted 10 messages, with 1 or more starred, in chat
40 awarded

Tag Badges

You must have a total score of 100 in at least 20 non-community wiki answers to achieve this badge.
75 awarded

Moderation Badges

First flagged post
392 awarded
First rollback
29 awarded
First down vote
406 awarded
Completed at least one review task. This badge is awarded once per review type
315 awarded
Deleted own post with score of 3 or higher
12 awarded
First edit
2.5k awarded
Edited first post that was inactive for 6 months
106 awarded
First retag
144 awarded
Deleted own post with score of -3 or lower
12 awarded
Approved or rejected 100 suggested edits
6 awarded
Used 30 votes in a day
64 awarded
First up vote
5k awarded
First approved tag synonym
7 awarded
First tag wiki edit
32 awarded
Used the maximum 40 votes in a day
30 awarded

Other Badges

Visited every section of the FAQ (retired)
138 awarded
Shared a link to a question that was visited by 25 unique IP addresses
224 awarded
Read the entire tour page
823 awarded